孕期微量元素和维生素的合理补充(4)
[12] Centers for Disease Control. Recommendations for the use of folic acid to reduce the number of cases of spina bifida and other neural tube defects[J]. MMWR Recomm Rep， 1992， 41(RR-14)：1-7.[13] Botto LD， Lisi A， Robert-Gnansia E， et al. International retrospective cohort study of neural tube defects in relation to folic acid recommendations： are the recommendations working？[J]. BMJ ......
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